Laserfiche WebLink
<br />~" <br /> <br />..\, <br /> <br />, <br /> <br />~. ..,... _4_--' ~_. ._....... <br /> <br />SWDP 1150-2-1 <br />26 ~y 78 <br /> <br />h. Pipelines sha1.1 have a minimum cover of 2 feet. <br /> <br />i. Compact all fill and backfill in 6-inch lifts as specified in <br />job specifications approved by the Corps of Engineers. <br /> <br />j. Fill, compact, and grade all disturbed areas. Reestablish <br />vegetation to its original condition. ' <br /> <br />k. Fill any pipelines to be abandoned under existing levees with <br />concrete. <br /> <br />1. See General Criteria. <br /> <br />5, CRITERIA FOR GRAVITY PIPELINE CROSSING EXISTING LEVEES. <br /> <br />a. Provide a temporary ring levee (cofferdam) on the river side of <br />the existing levee at the location of the subject crossing to the same <br />top elevation as the existing levee. Construct the levee of impervious <br />materials in accordance with the provisions specified in paragraph 6. <br /> <br />b. When the temporary ring levee is complete, excavate the existing <br />levee using 1 vertical on 3 horizontal cut slopes. The toe of the levee <br />cut shall be a minimum of 20 feet (measured horizontally) from the top <br />edge of the excavation. <br /> <br />c. Locate sources for borrow materials a minimum of 500 feet from <br />the land side toe of the existing levee. <br /> <br />d, All levee backfill shall consist of impervious materials. <br /> <br />e, Upon completion of the pipelL~e and before placing levee fill, <br />the entire foundation area to be occupied by the levee fill shall be <br />scarified, plowed, andlor harrowed to a depth of 6 inches and then <br />compacted by at least 16 complete passes of the tamping roller. <br /> <br />f. Accomplish levee replacements by placing fill in 6-inch lifts <br />and comoacting by not less than eight complete passes of a tamping <br />roller. The fill shall also be equal to 95 percent Standard AASHO <br />density. After compaction the moisture content shall be within the <br />limits of 3 percentage points above optimum to 2 percentage points below <br />optimum moisture content. <br /> <br /> <br />g, Determine the in-place moisture content and density of the levee <br />fill on a frequency of about one sample for each 2500 cubic yards of <br />backfill placed. <br /> <br />3 <br />